# Triangle3

> Advanced calculator for field work, specializing in triangle and pipe calculations with AR. (iPhone/iPad app by ryo sasaki.)

- Source: https://appshunter.io/ios/app/triangle3/id1643788233 (this page in markdown: same URL + `.md`)
- Developer: [ryo sasaki](https://appshunter.io/developer/318552526)
- Category: Productivity, Business
- Price: $3.99 (on sale, was $4.99)
- Age rating: 4+
- Requires: iOS 15.0 · 7 MB
- Languages: American English, French (France), Japanese
- Released: 2023-09-04
- Data updated: 2026-09-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/triangle3/id1643788233/reviews.md

## What is Triangle3?

This is a calculator application created by me, a canner, focusing on the functions of a calculator necessary for field work. 
Even if you don't understand trigonometric functions, you can easily calculate with this calculator.
It can calculate right triangles and unequal triangles.
It can calculate memory, answer memory, pi, repetition, parentheses, trigonometric functions, and cosine theorem. 
Develop cones (including misalignment), diagonal cuts, R-cuts, T-pipes, shrimp tubes, rounded corners, rounded corners (eccentricity), hopper eccentricity, pipes from mirror plates, connecting pipes to tapered pipes, screw wings, and calculate PCD.
It is possible to display the development on the floor in full size with AR for a specific development.


User's Manual ############################

Calculator section
Press and hold the "ANS" button to display past calculation results.
Tap the label of the calculation result (right after pressing =) to mark the value in the ANS list.
Tap the white button to enter the value displayed on the label.
Swipe the screen to the left or right to rotate the right triangle.
Swipe the screen up and down to flip the right triangle.
Enter two right triangles and three unequal triangles.
Tap the "Cal" button to display the calculation result.
Tap "Cl" button to clear the displayed value.
You can also use the "0" label to erase only the specified locations.
If you touch the button and slide it down, the numerical value of the calculation result will be displayed on the label, and can be used for the next calculation.
Trigonometric calculations can be done with
By sliding the [4] and [6] buttons, you can go back and forward.
Pressing the CLR button once will erase the number.
Press twice to reset the rotation.
Press and hold to erase numbers, reset rotation, and erase memory.
Press and hold to erase numbers, reset rotation, and clear memory.
Automatic input of pipe outline
Example 50A -> Input "5", "0", "1 slide".
　　1¼B -> Input "1", "4", "1" and "2 slides".
Each slide twice in succession will reduce the value by half.

Expansion section
The input method is the same as in the calculator section.
To expand a pipe, PCD, or mirror, slide the screen to the left or right to select the expansion diagram.
Basically, all buttons need to be entered, but in some places "0" can be used.
For round corners (eccentricity), double-tap the screen after entering the numerical value for round corners to switch to the input screen.
Please enter the division of the circumference in multiples of 4.
The calculation result is an image, so it may differ from the actual shape.

Disclaimer
Although every effort has been made to ensure the accuracy of the calculation results in this application, the accuracy is not guaranteed.
Please note that we are not responsible for any damage, loss, or disadvantage caused by the use of this application.

## Key features

- Right and unequal triangle calculations
- Complex shape development (cones, pipes, etc.)
- Augmented Reality (AR) floor plan visualization
- Standard calculator functions with memory
- Trigonometric and cosine theorem calculations
- PCD and screw wing calculations

## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/triangle3/id1643788233/reviews.md

### 5/5 — 職人

*2026-08-01*

エルボ　数値入れられないので改善おねがします　バク修正おねがいします

### 1/5 — 職人

*2026-07-09*

エルボ　数値入れられないので改善おねがします

### 1/5 — バグなのか

*2026-03-11*

三角形の図面しか出てこない

### 2/5 — ARとか言うのが使えない

*2024-12-22*

わざわざ購入して使えんやつあるなら書いといて欲しい
ARのボタン押したら画面真っ黒で何も使えない
有料にするなら全部使えるようにして欲しい

### 3/5 — エルボの展開図

*2024-10-31*

エルボ（エビ管）の展開図が全く異なる結果のですが、、、
（メールでも質問しましたがなかなかお返事いただけないのでこちらでもお伺いします）

### 3/5 — 教えて下さい。

*2024-08-01*

芯ずれのホッパーについて質問です。 仮に32等分した時に16の位置で折り返しだと思うのですが数字が違うのは何故でしょうか？ レビューすぐ消されてしまいますが再度質問させていただきます。

**Developer response:** 芯がずれたホッパーを円錐（Corn）の展開図として考えますと、芯がずれる方向で半分に割った際の展開図が、自然と反対側の展開図と同じ寸法になります。そのため、分割する数を展開図半分で、32等分としております。
一方、角丸（Rounded）形状の展開図の場合、円周上の32の分割点のうち、0°、90°、180°、270°の4点については、4角形の側面の4点のうち2箇所から線を引く必要があります。そのため、計算結果として円周の32等分に対し、線の寸法が35点出力されることになります。さらに、端部をつなぐ接合部の長さについては、上部の画像内に寸法を表示しております。

### 3/5 — 合わない

*2024-05-24*

エルボの芯合わせダミーサポートが正確に寸法入力しても合わない
CADで出した展開図と比べてみると全く違う

### 5/5 — 教えてください

*2024-04-29*

パイプの切り欠きの展開はARCでしょうか？
高さと長さは　高さ→欠ぎの深さ
長さ→パイプの円周
で間違いないですか？

**Developer response:** パイプ切り欠きの展開はCylinderの項になります。左右にスライドすることで、各種切り欠きが選択出来ます。

### 4/5 — iPad使用

*2023-12-21*

iPadを使って、PCDを使用した場合、穴を結ぶ線の位置がずれているのが気になりますが
それ以外は、大変素晴らしいアプリです。

### 5/5 — 最新バージョンリリースおめでとうございます。

*2023-09-09*

初めて使います。 初歩的な質問で恐縮です。 シリンダーに収録されているエルボに枝を付ける項目でRを指定するとありますがどこを測ればいいのでしょうか。 ご教示よろしくお願い致します。

**Developer response:** 早速のレビューありがとうございます。
このRはエルボパイプ中心のR寸法になります。よろしくお願いします

## Frequently asked questions about Triangle3

### What types of triangles can Triangle3 calculate?

Triangle3 can calculate both right triangles and unequal triangles. The app allows users to input dimensions for two right triangles and three unequal triangles for calculations.

### Does Triangle3 have ads?

No, Triangle3 does not contain advertisements. It is a paid application that offers an ad-free experience for its users.

### What complex shapes can Triangle3 develop?

Triangle3 can develop various complex shapes including cones (with misalignment), diagonal cuts, R-cuts, T-pipes, shrimp tubes, rounded corners (with eccentricity), hopper eccentricity, pipes from mirror plates, connecting pipes to tapered pipes, screw wings, and calculate PCD.

### What devices is Triangle3 compatible with?

Triangle3 is compatible with iPhone, iPod, and Apple Watch devices. This allows for calculations and visualizations across multiple Apple platforms.

### How does the AR feature in Triangle3 work?

The AR feature in Triangle3 allows for the display of specific developments, such as floor plans, in full size using augmented reality. This helps visualize the calculated shapes in a real-world context.

### What is the age rating for Triangle3?

Triangle3 has an age rating of 4+. This indicates that the content is generally suitable for all ages, with minimal or no mature content.

### How often is Triangle3 updated?

Triangle3 was last updated on April 21, 2026, with version 3.10.2. The release date was September 4, 2023, suggesting a relatively recent update cycle.

### Can Triangle3 be used offline?

As a paid calculator application, Triangle3 is designed to function without an internet connection. This ensures its utility for field work where connectivity may be limited.

## Version history (last 5 releases)

### 3.10.4 — 2026-08-19

Fixed an issue where a button overlapped another UI element on iPhone SE, making it impossible to tap.

### 3.10.3 — 2026-07-07

Improving stability of AR mode

### 3.10.2 — 2026-04-21

Fix for the misalignment of the interval calculation results graph

### 3.10.1 — 2025-12-19

Minor bug fixes

### 3.10 — 2025-07-22

Bug fixes in Interval's CLR 
Added input fields to Interval 
Review of AR

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## More apps by ryo sasaki

- [Triangle2](https://appshunter.io/ios/app/triangle2/id333257494)
- [TriangleS](https://appshunter.io/ios/app/triangles/id1572386611)
- [Cadrio](https://appshunter.io/ios/app/cadrio/id6760935730)
- [Cadrio3D](https://appshunter.io/ios/app/cadrio3d/id6787565313)

All apps by ryo sasaki: https://appshunter.io/developer/318552526

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-01.*